Professor Mark Modera, Director of the Western Cooling Efficiency Center

Dr. Modera, Director of the Western Cooling Efficiency Center, on-site at a demonstration utilizing the automated process of sealing using aerosolized adhesives for building envelopes in Stockton, California.

Mark Modera, Director of the Western Cooling Efficiency Center, will be presenting his field experience findings on sealing large building duct leakage with an aerosol-based sealing process. This presentation will be given to a large international audience in Washington DC on April 18th-19th at the AIVC (Air Infiltration and Ventilation Centre) International Workshop for Building and Ductwork Airtightness. Modera joins 40 other HVAC luminaries that span 16 different countries to give presentations that explore the problems, solutions and best practices for dealing with the energy loss due to leaky buildings and ductwork.

Modera’s work in this field spans over 2 decades of research and the successful creation of an automated duct-leakage sealing system. This system, first commercialized for residential applications, utilizes aerosolized adhesives to seek out leaks–even those that go undetected by manual sealing–and seal them quickly, with real-time verification. His presentation focuses on a field study that shows the efficacy of this technology in larger commercial building applications by applying the aerosol technology to 11 different buildings and sealing these ducts by over 90%.

In residential applications, the main motivating factor for sealing ducts is to save energy. Larger commercial applications are interested in this potential as well, but the initial cost to test and implement such a system in larger buildings is quite significant if energy savings were the only impetus. It turns out that there are other important reasons for sealing ductwork in large buildings that include: 1) reducing inadequate zone air flow 2) getting a building to proper code specifications for flows or pressures 3) comfort and 4) reducing overall ventilation rates. Mitigating these factors can be much more financially beneficial to building owners than just pure energy concerns.

Download Dr. Modera’s research summary


About AIVC
Ventilation and air infiltration into buildings represent a substantial energy demand which can account for between 25% to over 50% of a building’s total space heating (or cooling) needs. Unnecessary or excessive air change can therefore have an important impact on global energy use. On the other hand insufficient ventilation may result in poor indoor air quality and consequential health problems.

Designing for optimum ventilation performance is hence a vital part of building design. This task is made especially difficult, however, by the complexities of airflow behaviour, climatic influences, occupancy patterns and pollutant emission characteristics.

In recognition of the significant impact of ventilation on energy use, combined with concerns over indoor air quality, the International Energy Agency (IEA) inaugurated the Air Infiltration and Ventilation Centre in 1979 (To be more precise, the AIVC is one of the annexes running under the ECBCS, Energy Conservation in Buildings and Community Systems, which is one of the Implementing Agreements of the IEA). The AIVC offers industry and research organisations technical support aimed at optimising ventilation technology. We offer a range of services and facilities, including comprehensive database on literature standards, and ventilation data.

We also produce a series of guides and technical notes.The Centre holds annual conferences and workshops.

The operating agent of the AIVC is INIVE eeig (

The following countries participate in the AIVC.

Belgium, Czech Republic, Denmark, France, Germany, Greece, Italy, Japan, Netherlands, New Zealand, Norway, Portugal, Republic of Korea, Sweden, USA